Using the Modem Features
The ThinkPad modem, available on the ThinkPad 770ED computer,
enables you to send or receive data, faxes, and voice over the
telephone line. This modem uses a digital signal processor (DSP)
and is capable of 56-kbps data transmission under the Windows 95
and Windows NT environment.
You can use the following functions with the ThinkPad Modem:
Data modem functions
– Asynchronous communication port interface (NS16550A
UART compatible) operation
– ITU-T V.34 up to 33.6 Kbps data modem
– ITU-T V.32bis protocols with data rates of 4800, 7200, 9600,
12000, and 14000 bps
– ITU-T V.32 protocols with data rates of 4800, 9600 uncoded,
and 9600 bps Trellis coded
– ITU-T V.21/V.22, V.22bis protocols with data rates from 300
bps to 2400 bps
– Hayes** AT command set compatibility
– Asynchronous error recovery protocol
– Microcom Network Protocol (MNP**) protocols
- Error correction via MNP classes 1–4
- Data compression via MNP class 5 and V.42bis
- MNP class 5 for up to 2x data compression
– VoiceView (Windows 95 only)
– X2** Protocol with data rates of 56 Kbps (Windows 95 and
Windows NT only)
Facsimile (fax) modem functions
– Class 1 fax modem
– Class 2 fax modem
– G3 transfers
– ITU-T T.4 & T.30 operations
– ITU-T V.27ter-2400/4800 bps send/receive
– ITU-T V.29-7200/9600 bps send/receive
– ITU-T V.17-14400 bps send/receive
You can use the ThinkPad modem only on a public-switched
telephone network (PSTN). You cannot use a private branch
exchange (PBX) or some other type of digital telephone extension
line. If you connect the modem to a line other than PSTN, an error
Chapter 2. Supplementary Information
17
